- Show pÙ(qÚr) « (pÙq) Ú (pÙr) is a tautology.
- Let P(x,y) be the statement “x + y = x - y”, what are true value of "y "x P(x,y) and "x "y P(x,y), where the domain consists of all real numbers?
- Let P(x,y) be the statement “xy = y”, what are true value of $y "x P(x,y) and "x $y P(x,y), where the domain consists of all real numbers?
- Let P(x,y) be the statement “x2 + y2 = 5”, what are true value of $y $x P(x,y) and $x $y P(x,y), where the domain consists of all real numbers?
- Exercises 2, on page 72 of the discreet mathematics book
這是我在書上看到的題目~~~
拿出來考考親愛的大家~~~
因為我剛學沒多久~
看的懂的人可能會覺得很簡單吧~~
感覺書上寫的好複雜押~~
希望各位高手給個指點~~